EP3701766B1 - Bandbreitenteilbetrieb für direktzugriff im rrc-verbindungsmodus - Google Patents

Bandbreitenteilbetrieb für direktzugriff im rrc-verbindungsmodus Download PDF

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Publication number
EP3701766B1
EP3701766B1 EP18882820.6A EP18882820A EP3701766B1 EP 3701766 B1 EP3701766 B1 EP 3701766B1 EP 18882820 A EP18882820 A EP 18882820A EP 3701766 B1 EP3701766 B1 EP 3701766B1
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EP
European Patent Office
Prior art keywords
bwp
random access
initial
access preamble
sending
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Not-in-force
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EP18882820.6A
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English (en)
French (fr)
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EP3701766A1 (de
EP3701766A4 (de
Inventor
Cong SHI
Weijie Xu
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Publication of EP3701766A4 publication Critical patent/EP3701766A4/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0096—Indication of changes in allocation
    • H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the present disclosure relates generally to communication systems. More specifically, the present disclosure relates to systems and methods for initiating enhanced random access communication in the fifth generation mobile communication technology.
  • the 5G as defined by the 3rd Generation Partnership Project (3GPP) International Organization for Standardization, is expected to address random access between a User Equipment (UE) and a network node in a way similar to a Long Term Evolution (LTE) system.
  • 3GPP 3rd Generation Partnership Project
  • Related technologies include:
  • An embodiment of this disclosure relates to a method of initiating a Random Access communication between a 5G User Equipment (UE) and a 5G network node the method comprising: if the current active UL-BWP of the UE has valid PRACH resources, the UE sending the Random Access Preamble on said current active UL-BWP; and if the current active UL- BWP of the UE has no valid PRACH resources, the UE sending the Random Access Preamble on the initial UL BWP; the method further comprising: the UE monitoring the RAR in the initial DL-BWP.
  • UE User Equipment
  • Another embodiment of this disclosure relates to a method of initiating a Random Access communication between a 5G User Equipment (UE) and a 5G network node; the method comprising: if the current active UL-BWP of the UE has valid PRACH resources, the UE sending the Random Access Preamble on said current active UL-BWP; and if the current active UL- BWP of the UE has no valid PRACH resources, the UE sending the Random Access Preamble on the initial UL BWP; the method further comprising: the UE monitoring the RAR in a default DL-BWP.
  • UE User Equipment
  • the default DL-BWP can be the DL-BWP with the same index as that of the current active UL-BWP. For example, if the current active UL-BWP has PRACH resources, and the ID of the current active UL BWP is 2, then the UE switches the current active DL BWP to the DL BWP with ID 2.
  • Another embodiment of this disclosure relates to a method of initiating a Random Access communication between a 5G User Equipment (UE) and a 5G network node; the method comprising: the UE sending the Random Access Preamble on the initial UL-BWP; and the UE monitoring the RAR in the initial DL-BWP.
  • UE User Equipment
  • Another embodiment of this disclosure relates to a method of initiating a Random Access Communication between a 5G User Equipment (UE) and a 5G network node; the method comprising: the UE sending the Random Access Preamble on the initial UL-BWP; and the UE monitoring the RAR in a default DL-BWP.
  • UE User Equipment
  • the PRACH resources are defined according to a legacy 3GPP standard.
  • the method comprises the UE receiving a definition of the PRACH resources in a SIB message issued by the network node prior to sending the Random Access Preamble.
  • the method comprises the UE receiving higher layer information about the initial UL-BWP and the initial DL-BWP prior to sending the Random Access Preamble.
  • the method comprises the network node sending a Random Access Response in reply to the Random Access Preamble on the initial DL-BWP.
  • Embodiments of the Disclosure are also directed at apparatuses arranged, by hardware and/or by programming, to implement the methods outlined above.
  • Figure 1 illustrates a random access procedure of related art.
  • a user equipment (UE) 10 seeks access to a network node 12 of a network (not shown) in order to register and communicate.
  • the random access procedure serves as an uplink control procedure to enable the UE to access the network and acquire proper uplink timing (synchronize uplink). Since the initial access attempt cannot be scheduled by the network, the initial random access procedure is contention based. Collisions may occur and a contentionresolution scheme is therefore implemented.
  • the related art provides for first transmitting a Random Access Preamble, whose purpose is to obtain uplink synchronization, before eventually transmitting user data.
  • the reasons for initiating the random access procedure comprise: Initial access from RRC_IDLE; RRC Connection Re-establishment procedure; Handover; DL or UL data arrival during RRC_CONNECTED when UL synchronization status is "non-synchronized”; Transition from RRC_INACTIVE; To establish time alignment at SCell addition; Request for Other System Information (SI); and Beam failure recovery.
  • Initial access from RRC_IDLE RRC Connection Re-establishment procedure
  • Handover DL or UL data arrival during RRC_CONNECTED when UL synchronization status is "non-synchronized”
  • Transition from RRC_INACTIVE To establish time alignment at SCell addition
  • SI System Information
  • the UE When the UE wants to transmit uplink data, it needs to be in RRC_CONNECTED mode, have its uplink synchronized (assigned MAC time alignment timer has not expired), and have scheduling request resources configured. If any of these requirements is not met, the UE initiates the random access procedure.
  • the goal of the random access procedure is to acquire proper uplink timing to enable the UE to send uplink data.
  • Figure 1 outlines a basic random access procedure.
  • the figures illustrate messages communicated between UE 10 and network node 12, such as an enhanced Node B or "eNB.”
  • Figure 1 illustrates a contention based random access procedure in the case of initial access.
  • the UE 10 sends a Random Access Preamble to the network node 12.
  • the random access preambles are transmitted over the Physical Random Access Channel (PRACH), which is detailed hereafter, whereby the transmission of preambles is limited to certain time and frequency resources.
  • PRACH time and frequency resources are configured by upper layers (in the SIB-2 system information message periodically emitted by the Network Node).
  • FDD-frame structure format 1 the PRACH frequency can currently vary from every subframe to once in every other radio frame (i.e., once in every 20 ms).
  • the PRACH resource has a bandwidth corresponding to 6 physical resource blocks.
  • the length of the PRACH preamble in time depends on the preamble format being used.
  • the configuration of the PRACH resources in a cell is done by RRC protocol, and the configuration is the same for all UEs in a cell.
  • the network node 12 sends the UE 10 a random access response.
  • the random access response can be sent using the Physical Downlink Shared Channel (PDSCH), as detailed hereafter.
  • the random access response includes an uplink grant for the UE 10.
  • the UE 10 sends the network node an RRC Connection Request.
  • the message is sent using the uplink resources assigned by the network node in step 16.
  • the message requests to establish a connection at the radio resource control (RRC) layer.
  • RRC Connection Request can be sent on the Physical Uplink Shared Channel (PUSCH), as detailed hereafter.
  • the network node 12 sends the UE 10 an RRC Connection Setup message in order to establish the RRC connection.
  • the UE 10 can send a RRC connection complete message (not illustrated).
  • a RRC connection Request in msg3
  • a corresponding RRC connection complete message in msg4
  • RACH is initiated by other events, for example, when uplink syncro is not obtained
  • the msg3 may not include RRC connection request message.
  • the above protocol avoids contention by including, in the Random Access Response issued by the network node 12, an identifier derived from the Random Access Preamble, that allows UE 10 to know that the network node 12 responds to the UE 10 and not to another UE (not illustrated) that would also be awaiting for a Random Access Response.
  • Figure 2 illustrates a uplink channel frequency map as a function of time, comprising essentially a wide Physical Uplink Shared Channel (PUSCH) 22 that occupies most of the bandwidth available for upload, and two narrow edge channels/bands 24, 26 forming together a Physical Uplink Control Channel (PUCCH). Further, narrow channels 28 forming a Physical Random Access Channel (PRACH), having a frequency height of 6 Resource Blocks (RB) each and a time length that can vary with the modulation scheme used, are periodically present at a determined location of the PUSCH 22.As outlined above, the PRACH time and frequency resources are configured in a SIB-2 message that is periodically emitted by the Network Node.
  • PRACH Physical Random Access Channel
  • FIG. 3 illustrates a downlink channel frequency map as a function of time.
  • the downlink channel comprises, repeated twice every 10 ms, a Primary Synchronization Signal (PSS)channel 30 and a Secondary Synchronization Signal (SSS) channel 32 having each a height of 6 RB.
  • the downlink channel further comprises, repeated once every 10 ms, a Physical Broadcast Channel (PBCH) 34 having also a height of 6 RB.
  • the PBCH broadcasts a Master Information Block (MIB) specific to the network node 12, that allows UE 10 to access a Physical Downlink Control Channel (PDCCH) 36 that is repeated every 1 ms and is essentially as high as the bandwidth available for Downlink.
  • MIB Master Information Block
  • the remainder of the RBs that form the downlink channel form the Physical Downlink Shared Channel (PDSCH) 38, which broadcasts the data directed at the various UEs in communication with the network node.
  • the PDCCH 36 broadcasts numerous information, in particular the SIB-2 signal that defines the PRACH as outlined above.
  • the PDCCH 36 also contains a mapping of what RB contains data dedicated to what UE.
  • the UE in a 5G RRC connection setup, can be configured with up to four BandWidth Parts (BWP) in the downlink -with a single DownLink BandWidth Part (DL-BWP) being active at a given time- and with up to four BWP in the uplink -with a single UpLink BWP being active at a given time-.
  • BWP BandWidth Parts
  • DL-BWP DownLink BandWidth Part
  • DL-BWP DownLink BandWidth Part
  • UpLink BWP being active at a given time-.
  • the UE is not expected to receive PDSCH, PDCCH, or CSI-RS (except for RRM) outside its active DL-BWP.
  • the UE shall not transmit on PUSCH or PUCCH outside its active UL-BWP.
  • BWP selection (or BWP switching) can be done by several different ways as listed below:
  • the inventors have noted that, because 5G provides that the UL-BWP of a UE can be changed during the operation of the UE, it is not certain that the UL-BWP that is active at any given time has actually valid PRACH resources. It follows that, if for any reason the UE wants to initiate a Random Access Communication, at any time, it may have to change from its active UL-BWP to a UL-BWP having valid PRACH resources.
  • the inventors have also noted that, because 5G provides that a network node that receives a Random Access Preamble does not know the configuration of the UE that has sent the Random Access Preamble, the network node has no way to know what is the active DL-BWP of the UE, and thus does not know on which DL-BWP to send the Random Access Response.
  • a solution is for the Network Node to send the Random Access Response on all the DL-BWP for all the UEs. However, this solution leads to a low resource efficiency.
  • An initial DL/UL BWP pair is active for a UE until the UE is explicitly (re)configured with bandwidth part(s) during or after RRC connection is established.
  • the initial active DL/UL BWP is confined within the UE minimum bandwidth for the given frequency band.
  • the activation/deactivation of the DL BWP of a UE can result from a timer instructing the UE to switch its active DL-BWP to a default DL-BWP.
  • the default DL-BWP can be -or not-the initial active DL-BWP of the UE.
  • Figure 4 illustrates a method, according to an embodiment of the present disclosure, of initiating a Random Access communication between a 5G UE and a 5G network node.
  • the PRACH resources are defined according to a legacy 3GPP standard; for example the related art illustrated in Figure 1 .
  • the UE 10 in Figure 1 can be a 5G UE according to an embodiment of this disclosure and that the node 12 in Figure 1 can be a 5G network node according to an embodiment of this disclosure.
  • UE 10 can receive a definition of the PRACH resources in a SIB-2 message issued by the network node 12 prior to sending the Random Access Preamble.
  • Figure 4 illustrates a case where the active UL-BWP 40 of the UE happens to have valid PRACH resources 42.
  • the UE sends the Random Access Preamble 14 on its current active UL-BWP 40.
  • the UE 12 can receive higher layer information about the initial UL-BWP and the initial DL-BWP prior to sending the Random Access Preamble.
  • initial BWP can be determined by the frequency band on which the SSB is received (where SSB is a combined signaling block sent from network to UE including MIB, PSS, SSS outlined here above).
  • the UE will monitor the Random Access Response (RAR) in its initial DL-BWP 46, whatever its current active DL-BWP 44 at the time the Random Access Preamble is sent.
  • the network node 12 is arranged for sending a Random Access Response in reply to the Random Access Preamble from UE 10.
  • the network node is accordingly programmed for, when receiving a Random Access Preamble, sending the Random Access Response on the initial DL-BWP 46 of the cell -and therefore of the UE- (the initial BWP is not necessarily the same for all the cells. However, it's the same for all the UEs in the same cell).
  • Figure 5 illustrates an operation of the same embodiment as in Figure 4 , where the active UL-BWP 50 of the UE 10 happens to not have valid PRACH resources 52.
  • the UE 10 switches to its initial UL-BWP 54, which has the valid PRACH resources 52, and sends the Random Access Preamble 14 on initial UL-BWP 54.
  • the UE will monitor the Random Access Response (RAR) in its initial DL-BWP56, whatever its current active DL-BWP 58 at the time the Random Access Preamble is sent; and the network node must be programmed for sending the Random Access Response on the initial DL-BWP56.
  • RAR Random Access Response
  • Figure 6 illustrates a method, according to a second embodiment of the present disclosure, of initiating a Random Access communication between a 5G UE 10 and a 5G network node 12.
  • the embodiment illustrated in Figures 6 and 7 is similar to the embodiment illustrated in Figures 4 and 5 , but differs in that instead of having the UE 10 arranged for monitoring the Random Access Response (RAR) in its initial DL-BWP, whatever its current active DL-BWP 44 at the time the Random Access Preamble is sent, the UE 10 is arranged for monitoring the Random Access Response (RAR) in a default DL-BWP 60.
  • RAR Random Access Response
  • the default DL-BWP can be the DL-BWP with the same index as that of the current active UL-BWP. For example, if the current active UL-BWP has PRACH resources, and the ID of the current active UL BWP is 2, then the UE switches the current active DL BWP to the DL BWP with ID 2.
  • the network node 12 is arranged for sending a Random Access Response in reply to the Random Access Preamble from UE 10.
  • the network node is accordingly programmed for, when receiving a Random Access Preamble, sending the Random Access Response on the default DL-BWP 60.
  • Figure 7 illustrates an operation of the same embodiment as in Figure 6 , where the active UL-BWP 50 of the UE 10 happens to not have valid PRACH resources 52.
  • the UE 10 switches to its initial UL-BWP 54, which has the valid PRACH resources 52, and sends the Random Access Preamble 14 on initial UL-BWP 54.
  • the UE 10 will monitor the Random Access Response (RAR) in a default DL-BWP 60, whatever its current active DL-BWP 58 at the time the Random Access Preamble is sent; and the network node must be programmed for sending the Random Access Response on the default DL-BWP 60.
  • RAR Random Access Response
  • Figure 8 illustrates a method, according to a third embodiment of the present disclosure, of initiating a Random Access communication between a 5G UE 10 and a 5G network node 12.
  • the embodiment illustrated in Figure 8 is similar to the embodiments illustrated in Figures 4 / 5 and 6 / 7 , but differs essentially in that the UE 10 is arranged to switch to its initial UL-BWP 54, which has the valid PRACH resources 52, whatever its current active UL-BWP is.
  • the UE 10 is arranged for monitoring the Random Access Response (RAR) in its initial DL-BWP 56, whatever its current active DL-BWP is.
  • RAR Random Access Response
  • Figure 9 illustrates a method, according to a fourth embodiment of the present disclosure, of initiating a Random Access communication between a 5G UE 10 and a 5G network node 12.
  • the embodiment illustrated in Figure 9 is similar to the embodiment illustrated in Figure 8 , but differs essentially in that, as in the embodiment of Figures 6 and 7 , the UE 10 is arranged for monitoring the Random Access Response (RAR) in a default DL-BWP 60, whatever its current active DL-BWP is.
  • RAR Random Access Response
  • the present disclosure also relates to apparatuses (UE, network nodes) arranged for implementing the above described methods according to embodiments of the disclosure.
  • the apparatuses can be arranged so by using a hardware specifically made to implement said methods, or storing a program stored on a storage medium that, when run, implements said methods.
  • the present disclosure also relates to a storage medium storing a program that, when run, implements at least one of said methods.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (9)

  1. Verfahren zum Initiieren einer Random-Access-Kommunikation; wobei das Verfahren Folgendes umfasst:
    wenn ein aktueller aktiver UpLink BandWidth Part, UL-BWP, eines Benutzergeräts, UE, (10) gültige Physical-Random-Access-Channel- bzw. PRACH-Ressourcen aufweist, Senden, durch das UE, einer Random-Access-Präambel auf dem aktuellen aktiven UL-BWP; und
    wenn der aktuelle aktive UL-BWP des UE keine gültigen PRACH-Ressourcen aufweist, Senden, durch das UE, der Random-Access-Präambel auf einem Anfangs-UL-BWP;
    dadurch gekennzeichnet, dass das Verfahren ferner Folgendes umfasst:
    Überwachen, durch das UE, einer Random-Access-Antwort, RAR, in einem Anfangs-DownLink-BandWidth-Part, DL-BWP, ungeachtet eines aktuellen aktiven DL-BWP des UE zur Zeit des Sendens der Random-Access Präambel.
  2. Verfahren nach Anspruch 1, wobei die PRACH-Ressourcen gemäß einem 3rd-Generation-Partnership-Project- bzw. 3GPP-5G-Standard definiert sind.
  3. Verfahren nach Anspruch 1, umfassend Empfangen, durch das UE, einer Definition der PRACH-Ressourcen in einer Systeminformationsblock- bzw. SIB-Nachricht vor dem Senden der Random-Access-Präambel.
  4. Verfahren nach Anspruch 1, umfassend Empfangen, durch das UE, von Informationen höherer Schicht über den Anfangs-UL-BWP und den Anfangs-DL-BWP vor dem Senden der Random-Access-Präambel.
  5. Verfahren nach Anspruch 1, umfassend Empfangen, durch das UE, einer Random-Access-Antwort als Antwort auf die Random-Access-Präambel auf dem Anfangs-DL-BWP.
  6. Computerprogramm, umfassend Anweisungen, die bei Ausführung durch einen Prozessor eines Benutzergeräts, UE, (10) bewirken, dass das UE ein Verfahren nach einem der Ansprüche 1-5 ausführt.
  7. Nicht-flüchtiges computerlesbares Speichermedium, das ein Computerprogramm nach Anspruch 6 speichert.
  8. Signal, das ein Computerprogramm nach Anspruch 6 führt.
  9. Benutzergerät, UE, (10), das Folgendes umfasst:
    einen Speicher und einen Prozessor, wobei der Speicher ein oder mehrere Computerprogramme speichert, die bei Ausführung durch den Prozessor bewirken, dass der Prozessor Operationen gemäß einem der Ansprüche 1-5 ausführt.
EP18882820.6A 2017-11-28 2018-11-26 Bandbreitenteilbetrieb für direktzugriff im rrc-verbindungsmodus Not-in-force EP3701766B1 (de)

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Application Number Priority Date Filing Date Title
US201762591546P 2017-11-28 2017-11-28
PCT/CN2018/117532 WO2019105328A1 (en) 2017-11-28 2018-11-26 Bandwidth part operation for random access in rrc connected mode

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EP3701766A1 EP3701766A1 (de) 2020-09-02
EP3701766A4 EP3701766A4 (de) 2020-12-30
EP3701766B1 true EP3701766B1 (de) 2022-04-06

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EP (1) EP3701766B1 (de)
JP (1) JP6938777B2 (de)
KR (1) KR102345555B1 (de)
CN (2) CN111373832A (de)
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CN107396449B (zh) * 2017-08-31 2020-09-22 中国能源建设集团江苏省电力设计院有限公司 Td-lte电力无线专网特殊子帧的配置方法

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CN111373832A (zh) 2020-07-03
AU2018374138B2 (en) 2021-12-02
CN111885740A (zh) 2020-11-03
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US20200288508A1 (en) 2020-09-10
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